When Should a Sole Trader Become a Company in NZ?

Starting out as a sole trader is completely normal in New Zealand. It is simple, cheap, and requires almost no administration. But as your income grows and your business matures, there comes a point where operating as a sole trader starts costing you money — in tax, in liability exposure, and sometimes in credibility.

The question is not whether to eventually incorporate. For most successful sole traders, the answer is yes. The question is when.

As a sole trader, your business income is your personal income. It is taxed at individual marginal rates:

• Up to $14,000: 10.5%
• $14,001 – $48,000: 17.5%
• $48,001 – $70,000: 30%
• $70,001 – $180,000: 33%
• Over $180,000: 39%

A company pays a flat 28% corporate tax rate on its profits — regardless of how much profit it makes.

This means that once your business income pushes you into the 33% or 39% personal tax bracket, you are paying more tax as a sole trader than you would through a company. The difference compounds quickly at higher income levels.

As a sole trader, you and your business are the same legal entity. If your business is sued, your personal assets — your home, your savings, your car — are at risk.

A company is a separate legal entity. Shareholders are generally not personally liable for the company's debts (with some exceptions, including personal guarantees and director liability in certain circumstances). This separation is one of the most important reasons to incorporate.

Some clients and suppliers — particularly larger organisations — prefer to deal with companies rather than sole traders. It signals permanence, professionalism, and a degree of separation between the business and the individual. This is not universal, but it is a real factor in some industries.

A company requires more administration than a sole trader: annual returns to the Companies Office, separate financial statements, a company tax return, and more rigorous record-keeping. This has a cost — both in your time and in accounting fees.

The most common trigger for incorporating is reaching the point where the tax saving justifies the additional administration cost.

As a rough guide:

• Under $70,000 net profit: The tax difference between sole trader and company is modest. The administration cost of a company may outweigh the tax saving. Sole trader is often fine.
• $70,000 – $100,000 net profit: The 33% personal rate kicks in. A company at 28% starts to look attractive. Worth modelling with your accountant.
• Over $100,000 net profit: The tax saving from a company structure is almost always significant enough to justify incorporation. At this level, not incorporating is likely costing you money.

These are rough thresholds. Your specific situation — including other income, deductions, and family circumstances — will affect the calculation.

When you operate through a company, the company pays 28% tax on its profits. But you do not have to take all the profit out as salary. You can:

• Pay yourself a salary (taxed at personal rates, but you control the amount)
• Leave retained earnings in the company (taxed at 28%, not your personal rate)
• Pay dividends when it suits you (with imputation credits attached)

This flexibility lets you manage your personal income — and therefore your personal tax rate — in a way that is simply not possible as a sole trader.

Tax is not the only reason to incorporate. There are situations where incorporating makes sense even at lower income levels:

You have significant liability exposure. If your work carries real risk of a claim — trades, professional services, health, construction — the liability protection of a company is valuable regardless of income level.

You want to bring in a business partner or investor. A company structure makes it far easier to divide ownership, issue shares, and manage the relationship between owners. Sole trader partnerships are messy.

You want to sell the business eventually. Selling a company is generally cleaner and more tax-efficient than selling a sole trader business. If an exit is on your horizon, incorporating early gives you more options.

You want to separate business and personal finances clearly. Even at modest income levels, the discipline of operating through a company — with a separate bank account, separate financial statements, and clear records — can improve how you manage the business.

Registering a company in New Zealand costs $116.74 with the Companies Office. That is the easy part.

The real cost is the ongoing administration:

• Annual Companies Office return: $46
• Accounting fees for company accounts and tax return: typically $1,500–$3,500 per year more than sole trader accounting
• Additional complexity in your personal tax return

These costs need to be weighed against the tax saving and other benefits. At $100,000+ net profit, the numbers almost always stack up. At $50,000, it depends.

Moving from sole trader to company is straightforward but needs to be done correctly:

1. Register the company with the Companies Office
2. Open a company bank account
3. Transfer business assets and contracts to the company
4. Notify IRD of the new entity
5. Update your invoicing, contracts, and supplier arrangements
6. Ensure GST registration is transferred or re-registered if applicable

Your accountant should manage this process and make sure nothing falls through the cracks. Done properly, the transition is clean and does not disrupt your business.

If you are a sole trader earning over $70,000 net profit, it is worth having a conversation with your accountant about whether incorporating makes sense. If you are over $100,000, the answer is almost certainly yes — and every year you delay is money left on the table.

If you are in Christchurch or Canterbury and want to know whether the numbers stack up for your situation, we are happy to run through it with you.

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Eastmure & Associates advises SMEs and sole traders across Christchurch, Selwyn, and Waimakariri on business structure, tax planning, and incorporation. We handle the full transition from sole trader to company.